Yes, I too only toast nuts in the micro. I'm wondering if there is a cultural difference between the OP and the majority of eGullet participants. When I get in an Indian cooking spree, I am much more likely to go through a lot of seeds and nuts, and thus want to toast them. Day to day, not so much in my American diet. So a device like this feels unnecessary to me.
As a way of helping...what if it wasn't a new device but an attachment to an existing device. Kind of like the pasta add on for a Kitchenaid.